352 FOSSIL OSTREID^ OF NORTH AMERICA. 



PLATE XLIII. 



OsTREA CARINATA Lamarck. (Page 293.) 



Fia. 1. — A largo example ; natural size. After Rcemer. 



2, 3, 4. — Three different views of a smaller example ; also from Texas. 



OsTREA QUADRIPLICATA Sliumard. (Page 299.) 



5. — Exterior view of a lower valve having uunsually prominent lobes; natural 



size. 

 6,7. — Copies of Shumard's original figures. 



OsTREA CRENULIMAKGO Roemcr. (Page 294.) 



8,9. — Copies of Roemer's original figures; natural size. 



